package hsb.ruoyi.common.utils;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

/**
 * @author 胡帅博
 * @date 2023/1/6 21:11
 */
public class AesEncyptUtil {
    /**
     * AES加密模式
     */
    private static final String AES_MODE = "AES/CBC/NOPadding";
    /**
     * AES的iv向量值
     */
    private static final String AES_IV = "123456789012weir";

    public static final String AES_KEY = "weir123456789876";

    /**
     * 加密方法
     *
     * @param data 要加密的数据
     * @param key  加密key
     * @param iv   加密iv
     * @return 加密的结果
     * @throws Exception
     */
    public static String encrypt(String data, String key, String iv) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {

            Cipher cipher = Cipher.getInstance(AES_MODE);
            int blockSize = cipher.getBlockSize();
            byte[] dataBytes = data.getBytes();
            int plaintextLength = dataBytes.length;
            if (plaintextLength % blockSize != 0) {
                plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
            }
            byte[] plaintext = new byte[plaintextLength];
            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
            byte[] encrypted = cipher.doFinal(plaintext);
            return new Base64().encodeToString(encrypted);

    }

    /**
     * 解密方法
     *
     * @param data 要解密的数据
     * @param key  解密key
     * @param iv   解密iv
     * @return 解密的结果
     * @throws Exception
     */
    public static String desEncrypt(String data, String key, String iv) {
        try {
            byte[] encrypted1 = new Base64().decode(data);
            Cipher cipher = Cipher.getInstance(AES_MODE);
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original);
            return originalString;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 使用默认的key和iv加密
     *
     * @param data
     * @return
     * @throws Exception
     */
    public static String encrypt(String data) throws InvalidAlgorithmParameterException, NoSuchPaddingException, IllegalBlockSizeException, NoSuchAlgorithmException, BadPaddingException, InvalidKeyException {
        return encrypt(data, AES_KEY, AES_IV);
    }

    /**
     * 使用默认的key和iv解密
     *
     * @param data
     * @return
     * @throws Exception
     */
    public static String desEncrypt(String data) {
        return desEncrypt(data, AES_KEY, AES_IV);
    }

    public static void main(String[] args) throws InvalidAlgorithmParameterException, NoSuchPaddingException, IllegalBlockSizeException, NoSuchAlgorithmException, BadPaddingException, InvalidKeyException {
        System.out.println(AesEncyptUtil.encrypt("123456"));
        System.out.println(AesEncyptUtil.desEncrypt("DimebHZ8B8RLhcf4bCvhEw=="));
    }
}